nlist_ecoff.c revision 1.9
1 /* $NetBSD: nlist_ecoff.c,v 1.9 1999/09/16 11:45:01 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #if defined(LIBC_SCCS) && !defined(lint) 35 __RCSID("$NetBSD: nlist_ecoff.c,v 1.9 1999/09/16 11:45:01 lukem Exp $"); 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include "namespace.h" 39 #include <sys/param.h> 40 #include <sys/mman.h> 41 #include <sys/stat.h> 42 #include <sys/file.h> 43 44 #include <assert.h> 45 #include <errno.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include <a.out.h> /* for 'struct nlist' declaration */ 50 51 #include "nlist_private.h" 52 #ifdef NLIST_ECOFF 53 #include <sys/exec_ecoff.h> 54 #endif 55 56 #ifdef NLIST_ECOFF 57 #define check(off, size) ((off < 0) || (off + size > mappedsize)) 58 #define BAD do { rv = -1; goto out; } while (0) 59 #define BADUNMAP do { rv = -1; goto unmap; } while (0) 60 61 int 62 __fdnlist_ecoff(fd, list) 63 int fd; 64 struct nlist *list; 65 { 66 struct nlist *p; 67 struct ecoff_exechdr *exechdrp; 68 struct ecoff_symhdr *symhdrp; 69 struct ecoff_extsym *esyms; 70 struct stat st; 71 char *mappedfile; 72 size_t mappedsize; 73 u_long symhdroff, extstroff; 74 u_int symhdrsize; 75 int rv, nent; 76 long i, nesyms; 77 78 _DIAGASSERT(fd != -1); 79 _DIAGASSERT(list != NULL); 80 #ifdef _DIAGNOSTIC 81 if (fd == -1) { 82 errno = EBADF; 83 return (-1); 84 } 85 if (list == NULL) { 86 errno = EFAULT; 87 return (-1); 88 } 89 #endif 90 91 rv = -1; 92 93 /* 94 * If we can't fstat() the file, something bad is going on. 95 */ 96 if (fstat(fd, &st) < 0) 97 BAD; 98 99 /* 100 * Map the file in its entirety. 101 */ 102 if (st.st_size > SIZE_T_MAX) { 103 errno = EFBIG; 104 BAD; 105 } 106 mappedsize = st.st_size; 107 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 108 fd, 0); 109 if (mappedfile == (char *)-1) 110 BAD; 111 112 /* 113 * Make sure we can access the executable's header 114 * directly, and make sure the recognize the executable 115 * as an ECOFF binary. 116 */ 117 if (check(0, sizeof *exechdrp)) 118 BADUNMAP; 119 exechdrp = (struct ecoff_exechdr *)&mappedfile[0]; 120 121 if (ECOFF_BADMAG(exechdrp)) 122 BADUNMAP; 123 124 /* 125 * Find the symbol list. 126 */ 127 symhdroff = exechdrp->f.f_symptr; 128 symhdrsize = exechdrp->f.f_nsyms; 129 130 if (check(symhdroff, sizeof *symhdrp) || 131 sizeof *symhdrp != symhdrsize) 132 BADUNMAP; 133 symhdrp = (struct ecoff_symhdr *)&mappedfile[symhdroff]; 134 135 nesyms = symhdrp->esymMax; 136 if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms)) 137 BADUNMAP; 138 esyms = (struct ecoff_extsym *)&mappedfile[symhdrp->cbExtOffset]; 139 extstroff = symhdrp->cbSsExtOffset; 140 141 /* 142 * Clean out any left-over information for all valid entries. 143 * Type and value are defined to be 0 if not found; historical 144 * versions cleared other and desc as well. 145 * 146 * XXX Clearing anything other than n_type and n_value violates 147 * the semantics given in the man page. 148 */ 149 nent = 0; 150 for (p = list; !ISLAST(p); ++p) { 151 p->n_type = 0; 152 p->n_other = 0; 153 p->n_desc = 0; 154 p->n_value = 0; 155 ++nent; 156 } 157 158 for (i = 0; i < nesyms; i++) { 159 for (p = list; !ISLAST(p); p++) { 160 char *nlistname; 161 char *symtabname; 162 163 /* This may be incorrect */ 164 nlistname = p->n_un.n_name; 165 if (*nlistname == '_') 166 nlistname++; 167 168 symtabname = 169 &mappedfile[extstroff + esyms[i].es_strindex]; 170 171 if (!strcmp(symtabname, nlistname)) { 172 /* 173 * Translate (roughly) from ECOFF to nlist 174 */ 175 p->n_value = esyms[i].es_value; 176 p->n_type = N_EXT; /* XXX */ 177 p->n_desc = 0; /* XXX */ 178 p->n_other = 0; /* XXX */ 179 180 if (--nent <= 0) 181 goto done; 182 break; /* into next run of outer loop */ 183 } 184 } 185 } 186 187 done: 188 rv = nent; 189 unmap: 190 munmap(mappedfile, mappedsize); 191 out: 192 return (rv); 193 } 194 195 #endif /* NLIST_ECOFF */ 196
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